(CNN) - Add Al Gore to the list of big name surrogates who are making campaign cameos in the last remaining Senate election this year. The former vice president teams up with Jim Martin at a campaign event in Atlanta, Georgia.

Martin is a former Georgia state lawmaker who is the Democratic challenger to Saxby Chambliss, Georgia's freshman Republican senator who's fighting to keep his seat. The two candidates face off in a runoff election Tuesday, December 2.

Chambliss won a plurality of the vote on Election Day, but Georgia state law calls for the winner to grab 50 percent plus one vote. Due to the inclusion of a third party candidate, Chambliss fell just shy of that threshold, forcing a runoff contest.

Gore's campaign appearance follows that of former President Bill Clinton, who teamed up with Martin on Wednesday in Atlanta.

President-elect Barack Obama is lending his voice to the Democrats' efforts to win back the Republican-held senate seat in Georgia. Obama speaks out in a 60-second radio ad for Martin that hit the airwaves Friday.

A trio of former Republican presidential candidates have campaigned Sen. John McCain returned to the trail to campaign with Chambliss, just 9 days after losing the presidential election to Obama.

Last week, former Arkansas Gov. Mike Huckabee, who ran for the Republican presidential nomination before dropping out in March and backing McCain, campaigned with Chambliss.